152 
CXXXVI. ORCHIDE^E. 
[Bromheadia. 
long, crowded in a terminal head with ovate bracts imbricate. 
Flowers x in. across; pedicels-25 in. long. Sepals lanceolate acute, 
yellowish. Petals broader pale yellow. Lip side-lobes ovate 
yellowish dotted purple, midlobe yellow, 2 pink spots. Column 
thin broad. Hab. Not common. Johor, Tebing Tinggi. Pahang, 
Tahan River. Negri Sembilan, Siliau (Williams). Perak, Ipoh. 
(Ridley). Distrib. Borneo. 
50 . POLYSTACHYA, Lindl. 
Epiphytes with short pseudobulbs. -Leaves lanceolate thinly 
coriaceous. Inflorescence terminal erect, stem covered with papery 
bracts in the axils of which are one or more racemes or panicles 
of small green (or purple or yellow) flowers sub-sessile. Upper 
sepals lanceolate, laterals triangular adnate to the column foot. 
Petals very narrow. Lip jointed on the column foot clawed 
lobes small. Column short broad, foot long. Anther 1- to 2-celled. 
Pollinia 4 ovoid with (usually) a broad disc. Capsule small ellipsoid. 
Species 100, all tropics. Chiefly African. 
All our species are very closely allied and show very little difference from 
the Brazilian P. luteola Lindl. 
Lip narrow, side-lobes oblong; midlobe ovate . (1) P. singapurensis 
Lip broad, side-lobes short; midlobe oblong, 
much longer . . . . . . (2) P. penangensis 
Lip broad, side-lobes short; mid-lobe oblong, 
much longer . . . . . (3) P. siamensis 
(1) P. singapurensis Ridl. Journ. Linn. Soc. xxxii. 343; Mat. 
i. 146. 
Pseudobulbs globose, -25 in. long. Leaves oblong-lorate, 2 to 
4 in. long, 1 in. wide. Inflorescence 2 to 6 in. long; rachis of 
racemes pubescent. Flowers yellowish green. Bracts ovate acumi ¬ 
nate. Sepals bullate. Petals linear-spathulate. Lip narrow thin, 
side-lobes falcate linear acute, midlobe longer ovate pulverulent, 
spotted pink inside. No rostellum. Hab. Rare. On trees near 
the sea. Singapore, Sungei Morai (Ridley). 
(2) P. penangensis Ridl. l.c. 344; Mat. i. 146. 
Pseudobulbs conic, 1 in. long. Inflorescence 5 to 10 in. long. 
Racemes branched, x in. long. Flowers greenish yellow. Sepals 
and petals acute. Petals spathulate. Lip broad, side-lobes short 
ovate, midlobe ovate blunt hardly longer, pubescent yellow with a 
brown median line. Capsule *5 in. long, reticulate between the 
ribs. Hab. Local. Penang Hill at 1800 ft. altitude (Curtis). 
(3) P. siamensis Ridl. l.c. 343; Mat. i. 146. 
Pseudobulbs -5 to 1 in. long. Leaves 5 in. long, -5 to 1 in. wide. 
Inflorescence 4 to 12 in. long; rachis pubescent. Flowers larger 
and more fleshy than preceding. Bracts ovate subulate. Sepal 
upper ovate-lanceolate, laterals triangular green. Petals narrower, 
falcate acute white. Lip obovate broad, mealy, side-lobes small 
